From 413071dc2f13f581eb844a0009d571dfa0bb2f02 Mon Sep 17 00:00:00 2001
From: Lars Randers <lranders@mail.dk>
Date: Thu, 20 Jun 2024 13:55:40 +0000
Subject: [PATCH] BeagleV-Fire: Add MPFS TVS auxiliary driver
Signed-off-by: Lars Randers <lranders@mail.dk>
---
drivers/hwmon/Kconfig | 11 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/tvs-mpfs.c | 371 +++++++++++++++++++++++++++++++++
drivers/mailbox/mailbox-mpfs.c | 62 ++++++
4 files changed, 445 insertions(+)
create mode 100644 drivers/hwmon/tvs-mpfs.c
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index a5143d01b..e3564df18 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -2108,6 +2108,17 @@ config SENSORS_TMP513
This driver can also be built as a module. If so, the module
will be called tmp513.
+config SENSORS_TVS_MPFS
+ tristate "PolarFire SoC (MPFS) TVS"
+ depends on POLARFIRE_SOC_MAILBOX
+ help
+ This driver adds support for the PolarFire SoC (MPFS) Temperature Voltage Sensor.
+
+ To compile this driver as a module, choose M here. the
+ module will be called tvs-mpfs.
+
+ If unsure, say N.
+
config SENSORS_VEXPRESS
tristate "Versatile Express"
depends on VEXPRESS_CONFIG
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 11d076cad..1cebd0e73 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -203,6 +203,7 @@ obj-$(CONFIG_SENSORS_TMP401) += tmp401.o
obj-$(CONFIG_SENSORS_TMP421) += tmp421.o
obj-$(CONFIG_SENSORS_TMP464) += tmp464.o
obj-$(CONFIG_SENSORS_TMP513) += tmp513.o
+obj-$(CONFIG_SENSORS_TVS_MPFS) += tvs-mpfs.o
obj-$(CONFIG_SENSORS_VEXPRESS) += vexpress-hwmon.o
obj-$(CONFIG_SENSORS_VIA_CPUTEMP)+= via-cputemp.o
obj-$(CONFIG_SENSORS_VIA686A) += via686a.o
diff --git a/drivers/hwmon/tvs-mpfs.c b/drivers/hwmon/tvs-mpfs.c
new file mode 100644
index 000000000..087a8b33f
--- /dev/null
+++ b/drivers/hwmon/tvs-mpfs.c
@@ -0,0 +1,371 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *
+ * Author: Lars Randers <lranders@mail.dk>
+ *
+ */
+
+#include <linux/auxiliary_bus.h>
+#include <linux/err.h>
+#include <linux/freezer.h>
+#include <linux/kthread.h>
+#include <linux/hwmon.h>
+#include <linux/io.h>
+#include <linux/module.h>
+
+#define PFSOC_CONTROL_SCB_TVS_CONTROL 0x08
+#define PFSOC_CONTROL_SCB_TVS_OUTPUT0 0x24
+#define PFSOC_CONTROL_SCB_TVS_OUTPUT1 0x28
+
+#define CTRL_POWEROFF BIT(5)
+#define CTRL_ABORT BIT(4)
+#define CTRL_TEMP BIT(3)
+#define CTRL_2P5 BIT(2)
+#define CTRL_1P8 BIT(1)
+#define CTRL_1P05 BIT(0)
+
+#define OUTPUT0_U1P8_MASK 0x7FFF0000
+#define OUTPUT0_U1P8_OFF 16
+#define OUTPUT0_U1P0_MASK 0x00007FFF
+#define OUTPUT0_U1P0_OFF 0
+#define OUTPUT1_TEMP_MASK 0xFFFF0000
+#define OUTPUT1_TEMP_OFF 16
+#define OUTPUT1_U2P5_MASK 0x00007FFF
+#define OUTPUT1_U2P5_OFF 0
+
+/*
+ * Poll intervals (in milliseconds)
+ */
+#define MPFS_TVS_MIN_POLL_INTERVAL 2000
+
+// The following constant is 273.5 in (16.4) fixedpoint notation
+#define MPFS_TVS_MIN_TEMP_IN_K 0x1112
+
+typedef struct {
+ long min;
+ long actual;
+ long max;
+} mpfs_tvs_sensor_t;
+
+typedef enum {
+ SN_V1P05 = 0,
+ SN_V1P8,
+ SN_V2P5,
+ SN_TEMP,
+
+ SN_MAX
+} mpfs_tvs_sn_t;
+
+static const char *mpfs_tvs_voltage_labels[] = { "U1P05", "U1P8", "U2P5" };
+
+struct mpfs_tvs {
+ struct device *dev;
+ struct device *hwmon_dev;
+ struct task_struct *poll_task;
+ bool kthread_running;
+ long update_interval; /* in milli-seconds */
+ mpfs_tvs_sensor_t sensors[SN_MAX];
+ void __iomem *ctrl_base;
+};
+
+static int mpfs_tvs_update_sensors(struct mpfs_tvs *data) {
+ u32 temp;
+ u32 work;
+
+ /* read measurement */
+ temp = readl(data->ctrl_base + PFSOC_CONTROL_SCB_TVS_OUTPUT1);
+ work = temp;
+
+ /* compute temperature */
+ temp = (temp & OUTPUT1_TEMP_MASK) >> OUTPUT1_TEMP_OFF;
+ temp = clamp_val(temp, MPFS_TVS_MIN_TEMP_IN_K, INT_MAX);
+ temp = temp - MPFS_TVS_MIN_TEMP_IN_K; /* Kelvin to Celsius */
+ temp = (temp * 1000) >> 4;
+ data->sensors[SN_TEMP].actual = temp;
+ data->sensors[SN_TEMP].max =
+ max(data->sensors[SN_TEMP].actual, data->sensors[SN_TEMP].max);
+ data->sensors[SN_TEMP].min =
+ min(data->sensors[SN_TEMP].min, data->sensors[SN_TEMP].actual);
+
+ /* compute voltage */
+ work &= OUTPUT1_U2P5_MASK;
+ work = (1 * work) >> 3;
+ data->sensors[SN_V2P5].actual = work;
+ data->sensors[SN_V2P5].max =
+ max(data->sensors[SN_V2P5].actual, data->sensors[SN_V2P5].max);
+ data->sensors[SN_V2P5].min =
+ min(data->sensors[SN_V2P5].min, data->sensors[SN_V2P5].actual);
+
+ temp = readl(data->ctrl_base + PFSOC_CONTROL_SCB_TVS_OUTPUT0);
+ work = temp;
+ temp = (OUTPUT0_U1P8_MASK & temp) >> OUTPUT0_U1P8_OFF;
+ temp = (1 * temp) >> 3;
+ data->sensors[SN_V1P8].actual = temp;
+ data->sensors[SN_V1P8].max =
+ max(data->sensors[SN_V1P8].actual, data->sensors[SN_V1P8].max);
+ data->sensors[SN_V2P5].min =
+ min(data->sensors[SN_V1P8].min, data->sensors[SN_V1P8].actual);
+
+ work &= OUTPUT0_U1P0_MASK;
+ work = (1 * work) >> 3;
+ data->sensors[SN_V1P05].actual = work;
+ data->sensors[SN_V1P05].max =
+ max(data->sensors[SN_V1P05].actual, data->sensors[SN_V1P05].max);
+ data->sensors[SN_V1P05].min =
+ min(data->sensors[SN_V1P05].min, data->sensors[SN_V1P05].actual);
+
+ return 0;
+}
+
+
+static int mpfs_tvs_chip_read(struct mpfs_tvs *data, long *val)
+{
+ *val = data->update_interval;
+ return 0;
+}
+
+static int mpfs_tvs_temp_read(struct mpfs_tvs *data, u32 attr,
+ int channel, long *val)
+{
+ switch(attr) {
+ case hwmon_temp_input:
+ *val = data->sensors[SN_TEMP].actual;
+ break;
+
+ case hwmon_temp_max:
+ *val = data->sensors[SN_TEMP].max;
+ break;
+
+ default:
+ return -EOPNOTSUPP;
+ }
+ return 0;
+}
+
+static int mpfs_tvs_voltage_read(struct mpfs_tvs *data, u32 attr,
+ int channel, long *val)
+{
+ dev_dbg(data->dev, "read voltage chan %d\n", channel);
+ switch(attr) {
+ case hwmon_in_input:
+ *val = data->sensors[channel].actual;
+ break;
+
+ case hwmon_in_max:
+ *val = data->sensors[channel].max;
+ break;
+
+ default:
+ return -EOPNOTSUPP;
+ }
+ return 0;
+}
+
+
+static ssize_t mpfs_tvs_interval_write(struct mpfs_tvs *data, long val)
+{
+ data->update_interval = clamp_val(val,
+ MPFS_TVS_MIN_POLL_INTERVAL, INT_MAX);
+ return 0;
+}
+
+
+static umode_t mpfs_tvs_is_visible(const void *data,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel)
+{
+ if(type == hwmon_chip && attr == hwmon_chip_update_interval)
+ return 0644;
+
+ if(type == hwmon_temp) {
+ switch(attr) {
+ case hwmon_temp_input:
+ case hwmon_temp_max:
+ case hwmon_temp_label:
+ return 0444;
+
+ default:
+ return 0;
+ }
+ } else if (type == hwmon_in) {
+ switch (attr) {
+ case hwmon_in_input:
+ case hwmon_in_label:
+ return 0444;
+
+ default:
+ return 0;
+ }
+ }
+ return 0;
+}
+
+static int mpfs_tvs_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ struct mpfs_tvs *data = dev_get_drvdata(dev);
+
+ switch(type) {
+ case hwmon_temp:
+ return mpfs_tvs_temp_read(data, attr, channel, val);
+ case hwmon_in:
+ return mpfs_tvs_voltage_read(data, attr, channel, val);
+ case hwmon_chip:
+ return mpfs_tvs_chip_read(data, val);
+
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static int mpfs_tvs_write(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long val)
+{
+ struct mpfs_tvs *data = dev_get_drvdata(dev);
+
+ switch(type) {
+ case hwmon_chip:
+ return mpfs_tvs_interval_write(data, val);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static int mpfs_tvs_read_labels(struct device *dev,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel,
+ const char **str)
+{
+ switch(type) {
+ case hwmon_temp:
+ *str = "CPU Temp";
+ return 0;
+ case hwmon_in:
+ *str = mpfs_tvs_voltage_labels[channel];
+ return 0;
+ default:
+ return -ENOTSUPP;
+ }
+}
+
+
+static const struct hwmon_ops mpfs_tvs_ops = {
+ .is_visible = mpfs_tvs_is_visible,
+ .read_string = mpfs_tvs_read_labels,
+ .read = mpfs_tvs_read,
+ .write = mpfs_tvs_write,
+};
+
+static const struct hwmon_channel_info *mpfs_tvs_info[] = {
+ HWMON_CHANNEL_INFO(chip,
+ HWMON_C_REGISTER_TZ|HWMON_C_UPDATE_INTERVAL),
+ HWMON_CHANNEL_INFO(temp,
+ HWMON_T_INPUT|HWMON_T_MIN|HWMON_T_MAX|HWMON_T_LABEL),
+ HWMON_CHANNEL_INFO(in,
+ HWMON_I_INPUT|HWMON_I_LABEL,
+ HWMON_I_INPUT|HWMON_I_LABEL,
+ HWMON_I_INPUT|HWMON_I_LABEL),
+ NULL
+};
+
+static const struct hwmon_chip_info mpfs_tvs_chip_info = {
+ .ops = &mpfs_tvs_ops,
+ .info = mpfs_tvs_info,
+};
+
+
+static int mpfs_tvs_poll_task(void *ptr)
+{
+ struct mpfs_tvs *data = ptr;
+ int ret = 0;
+
+ data->kthread_running = true;
+
+ set_freezable();
+
+ while(!kthread_should_stop()) {
+ schedule_timeout_interruptible(data->update_interval);
+ try_to_freeze();
+ ret = mpfs_tvs_update_sensors(data);
+ if(ret)
+ break;
+ }
+
+ data->kthread_running = false;
+ return ret;
+}
+
+static int mpfs_tvs_probe(struct auxiliary_device *auxdev,
+ const struct auxiliary_device_id *id)
+{
+ struct device *dev = &auxdev->dev;
+ struct device *hwmon_dev;
+ struct mpfs_tvs *data;
+ struct task_struct *task;
+ int err;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if(!data)
+ return -ENOMEM;
+
+ data->ctrl_base = (void __iomem *)auxdev->dev.platform_data;
+
+ data->dev = dev;
+ data->kthread_running = false;
+
+ hwmon_dev = devm_hwmon_device_register_with_info(dev, "mpfs_tvs",
+ data,
+ &mpfs_tvs_chip_info,
+ NULL);
+
+ if(IS_ERR(hwmon_dev)) {
+ err = PTR_ERR(hwmon_dev);
+ dev_err(dev, "Class registration failed (%d)\n", err);
+ return err;
+ }
+
+ /* enable HW sensor */
+ writel(CTRL_1P05 | CTRL_1P8 | CTRL_2P5 | CTRL_TEMP,
+ data->ctrl_base + PFSOC_CONTROL_SCB_TVS_CONTROL);
+
+ data->hwmon_dev = hwmon_dev;
+ data->sensors[SN_TEMP].max = 0;
+ data->sensors[SN_V1P05].min =
+ data->sensors[SN_V1P8].min =
+ data->sensors[SN_V2P5].min = 20000;
+ data->sensors[SN_V1P05].max =
+ data->sensors[SN_V1P8].max =
+ data->sensors[SN_V2P5].max = 0;
+ data->update_interval = MPFS_TVS_MIN_POLL_INTERVAL;
+ mpfs_tvs_update_sensors(data);
+
+ task = kthread_run(mpfs_tvs_poll_task, data, "tvs-mpfs-kthread");
+ if (IS_ERR(task)) {
+ err = PTR_ERR(task);
+ dev_err(dev, "Unable to run kthread err %d\n", err);
+ return err;
+ }
+
+ data->poll_task = task;
+
+ dev_info(dev, "Registered MPFS TVS auxiliary driver\n");
+ return 0;
+}
+
+static const struct auxiliary_device_id mpfs_tvs_ids[] = {
+ {
+ .name = "mailbox_mpfs.tvs-mpfs",
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(auxiliary, mpfs_reset_ids);
+
+static struct auxiliary_driver mpfs_tvs_driver = {
+ .probe = mpfs_tvs_probe,
+ .id_table = mpfs_tvs_ids,
+};
+module_auxiliary_driver(mpfs_tvs_driver);
+
+MODULE_AUTHOR("Lars Randers <lranders@mail.dk>");
+MODULE_DESCRIPTION("MPFS temperature voltage sensor driver");
+MODULE_LICENSE("GPL");
\ No newline at end of file
diff --git a/drivers/mailbox/mailbox-mpfs.c b/drivers/mailbox/mailbox-mpfs.c
index 162df4965..198e6b37d 100644
--- a/drivers/mailbox/mailbox-mpfs.c
+++ b/drivers/mailbox/mailbox-mpfs.c
@@ -8,6 +8,7 @@
*
*/
+#include <linux/auxiliary_bus.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/init.h>
@@ -220,6 +221,64 @@ static const struct mbox_chan_ops mpfs_mbox_ops = {
.last_tx_done = mpfs_mbox_last_tx_done,
};
+static void mpfs_mbox_auxdev_release(struct device *dev)
+{
+ struct auxiliary_device *auxdev = to_auxiliary_dev(dev);
+
+ kfree(auxdev);
+}
+
+static struct auxiliary_device *mpfs_mbox_adev_alloc(struct device *parent_dev)
+{
+ struct auxiliary_device *auxdev;
+ int ret;
+
+ auxdev = kzalloc(sizeof(*auxdev), GFP_KERNEL);
+ if(!auxdev)
+ return ERR_PTR(-ENOMEM);
+
+ auxdev->name = "tvs-mpfs";
+ auxdev->dev.parent = parent_dev;
+ auxdev->dev.release = mpfs_mbox_auxdev_release;
+ auxdev->id = 10u;
+
+ ret = auxiliary_device_init(auxdev);
+ if(ret) {
+ kfree(auxdev);
+ return ERR_PTR(ret);
+ }
+
+ return auxdev;
+}
+
+static void mpfs_mbox_unregister_auxdev(void *dev)
+{
+ struct auxiliary_device *auxdev = dev;
+
+ auxiliary_device_delete(auxdev);
+ auxiliary_device_uninit(auxdev);
+}
+
+int mpfs_mbox_auxdev_register(struct device *parent_dev, void __iomem *base)
+{
+ struct auxiliary_device *auxdev;
+ int ret;
+
+ auxdev = mpfs_mbox_adev_alloc(parent_dev);
+ if(IS_ERR(auxdev))
+ return PTR_ERR(auxdev);
+
+ auxdev->dev.platform_data = base;
+
+ ret = auxiliary_device_add(auxdev);
+ if(ret) {
+ auxiliary_device_uninit(auxdev);
+ return ret;
+ }
+
+ return devm_add_action_or_reset(parent_dev, mpfs_mbox_unregister_auxdev, auxdev);
+}
+
static int mpfs_mbox_probe(struct platform_device *pdev)
{
struct mpfs_mbox *mbox;
@@ -261,6 +320,9 @@ static int mpfs_mbox_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "Registering MPFS mailbox controller failed\n");
return ret;
}
+
+ mpfs_mbox_auxdev_register(&pdev->dev, mbox->ctrl_base);
+
dev_info(&pdev->dev, "Registered MPFS mailbox controller driver\n");
return 0;
--
2.39.2